Flat Bottom Design for Landing Craft

Boat design net contributor IKE has collected very much valuable information for home builders such as ... USCG rules..BUOYANCY IN THE EVENT OF SWAMPING....

Floatation foam and its placement are critical for a small craft in cold water . Your boat with 400lbs of motor plus gear will take a substantial volume of foam floation in order to comply with USCG regs.

His site ..Newboatbuilders is well worth reviewing before you finalize your design.

http://newboatbuilders.com/pages/documents.html

 

Admiral boats are a good design that is used in similar to conditions where you live which pictures can give some idea.
I wonder about the time it takes to make from wood plus the maintenance needed and the extra weight versus something that has a built in trailer and should last a life time and most of all safe.

 

You might consider a cradle to rest the bow in when beached at the cabin (like a partial boat lift). That would let you keep a V-bow and still have the entire width of the hull supported at the front. A permanent installation shouldn't be too problematic if located at high tide - you would just have to time your landings/launchings for high tide.